Prognostic Meteorological Discussion
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FXUS01 KWBC 211945

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
344 PM EDT Wed Mar 21 2018

Valid 00Z Thu Mar 22 2018 - 00Z Sat Mar 24 2018

...Another nor`easter impacting the Mid-Atlantic northward into
coastal New England...

...Heavy rainfall with higher elevation snow to continue across

The fourth nor`easter is currently underway in the Atlantic and is
expected to move northward along the eastern seaboard over the
next few days.  The snowfall impacting the Mid-Atlantic will begin
to taper off this evening as the surface low of the nor`easter
pulls away from the region--with all the snow coming to an end by
tonight.  Lingering snow showers are possible along the central
Appalachians.  Meanwhile, the Northeast and New England will have
an increase in snowfall rates this evening and into tonight due to
the proximity of the surface low. The axis of heavy snow will
shift to coastal New England by early Thursday morning. By
Thursday afternoon, the low will move into the Canadian
Maritimes--with snow being confined mostly to Maine and finally
coming to an end by Thursday night.

Meanwhile, an axis of moisture will continue to deliver copious
amounts of precipitation to California. Heavy rainfall will occur
especially in southern California. The heavy rainfall coupled with
burn scars could lead to flash flooding and debris flows. Because
of this, a high risk for excessive rainfall is in effect through
Friday morning. In addition, heavy snow is expected for the Sierra
Nevada where snowfall accumulations of 2 to 4 feet are expected
with localized amounts up to 5 feet possible! Precipitation will
finally taper off along the Sierra Nevada mountains and southern
California by Friday morning. The Pacific Northwest and Great
Basin will also experience rain and higher elevation snow--with
coverage increasing across these regions by Thursday afternoon and
continuing into Friday.


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